Appendix 1 Drug–herb interaction chart
This chart is a designed as a quick reference only. Further investigation may be required before making a clinical decision. This chart has been compiled using evidence-based texts, journal articles and monographs to give a current summary of known drug–herb interactions. Where applicable, supportive evidence has been referenced to allow for further investigation. The chart has been designed using a colour-coded system to highlight the different levels of supportive evidence and clinical significance. The table uses drug class as major headings for ease of information retrieval, and provides a summary of important or clinically relevant information at the end of each heading.
 | Implies a serious interaction with known potential to cause harm or decreased drug effectiveness. Avoid concurrent use. |
 | Use caution. Interactions have some supportive evidence. Concurrent medical supervision or avoidance is advised. |
 | Observe. Interactions are largely theoretical and of unknown clinical significance and/or minimal supportive evidence. |
 | Implies a potential beneficial interaction. Interactions are largely theoretical and of unknown clinical significance and/or supportive evidence. |
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